Radiometer RZA-07D “Tetra – A” is designed to control contamination of workroom surfaces with alpha – active radionuclides, equipment and other objects by measurement of the flux density of alpha – particle.

Radiometer is used at nuclear fuel cycle facilities in the units responsible for controlling radiation situation.


Measurement range of flux density of alpha particles for


0,5 – 5·104 part/ min ∙cm2

Sensitivity of the radiometer

No less than 0,5 с-1/min-1∙сm-2

Limit of the basic relative error of the radiometer at p = 0,95

± (15 + 10/Ах) % *

Instability of the radiometer readings during 8 h of continuous operation

No more than 5 %

Level of the own radiometer background

No more than 0,3 part/ min ∙cm2

Operation mode setup time

No more than 5 min

Working area of the detector

70 сm2

Radiometer is resistant to the values of MED of gamma-radiation

10 mZv/h

Radiometer is powered by two batteries

Type of АА (R06) size

Time of operation from two just charged batteries

No less than  12 hours

Environment temperature

from -20°С to +50°С

Relative humidity

Up to 75 % at +30°С

Atmospheric pressure

from 84 to 106,7 kPa

Variable magnetic field of industrial frequency of the voltage

Up to 400 А/м

Level of casing protection

No worse than IP54

Resisting to

• Temperature and humidity radiometer refers to Group V2a;
• mechanical impact – group N2;
• atmospheric pressure – group P1 in accordance with GOST 27451
• Type of climatic performance – GOST 15150 U1

It is functional after 5 min impact of alpha radiation with flow density of

Up to 5∙107 part/ min ∙cm2

Additional error at max. influencing factor

No more than 25 %

Mean time between failures

No less than 8000 h

Average lifetime

Not less than 10 years

Overall dimensions

Ø122×190×230 mm

Weight of the radiometer

No more than 2,5 kg

* – Ах –numeric measured value

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